Mathematics · Geometry & Mensuration · page 12 of 12

Area, Perimeter and Volume MCQs with Answers

Includes 32 past paper MCQs (marked).

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Area, Perimeter and Volume MCQs (111–115)

5 MCQs with answers and a short one-liner. Hide answers to test yourself.

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111.
If the dot product of two nonzero vectors $\vec{A}$ and $\vec{B}$ is zero, then the magnitude of their cross product is:
Correct Answer: B. $AB$
One-liner
When the dot product of two nonzero vectors is zero, they are perpendicular, so the magnitude of their cross product is $AB$.
112.
The ratio of moment of inertia of a thin-walled cylinder to the moment of inertia of a solid sphere is _?
Correct Answer: C. $\frac{5}{2}$
One-liner
The ratio of the moment of inertia of a thin-walled cylinder ($MR^2$) to that of a solid sphere ($\frac{2}{5}MR^2$) is $\frac{5}{2}$.
113.
If $\cos \theta = \frac{4}{5}$ and $\theta$ lies in the 4th quadrant, then $\sin \theta =$ ?
Correct Answer: C. $-\frac{3}{5}$
One-liner
The value of $\sin \theta$ is $-\frac{3}{5}$ because sine is negative in the 4th quadrant.
114.
Past Paper MCQ
If tan x = 3/5, then cos x equals?
Correct Answer: C. 5/√34
One-liner
If tan x = 3/5, then cos x = 5/√34.
115.
Past Paper MCQ
If sin x = 15/17, then cos x equals?
Correct Answer: A. 8/17
One-liner
If sin x = 15/17, then cos x = 8/17.